Localization of divalent cations in phosphate-rich cytoplasmic granules in yeast [calcium, strontium, polyphosphates, X-ray microanalysis, Saccharomyces cerevisiae]
1980
Roomans, G.M. (Stockholm Univ. (Sweden). Wenner-Gren Inst.)
Phosphate-rich yeast cells (Saccharomyces cerevisiae) take up more calcium and strontium than phosphate-deficient cells. The divalent cations appear to be tightly bound in phosphate-rich cells. Electron microscopical investigations, combined with energy-dispersive X-ray microanalysis, showed that divalent cations were sequestered in cytoplasmic granules, together with a large amount of phosphorus. The major part of the divalent cations is retrieved in the polyphosphate fraction, a minor part is bound to lipids. The results suggest that polyphosphate granules may serve as an important store for divalent cations.
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